package com.qf.HuanChongLiu;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Scanner;

/**
 * @author WzYu
 * @date 2022-7-13 下午 9:36
 */
public class jiejue {
    public static void main(String[] args) {
        //字节输入流  输入输出流是相对的内存而言
        byte[] b = new byte[1024];
        int n=-1;
        System.out.println("请输入要读取的文件名：例如D:\\hello.txt");
        Scanner x = new Scanner(System.in);
        String str= x.nextLine();
        try{
            FileInputStream in = new FileInputStream(str);
            while((n=in.read(b,0,1024))!=-1){
                String s = new String (b,0,n);
                System.out.println(s);
            }

            in.close();
        }catch (IOException e){
            System.out.println(e.getMessage());
        }
        //字节输出流
        try{
            //FileOutputStream out = new FileOutputStream(str);
            String h1 = "Hello world!!";
            //覆盖写 删除原来所有的
            //out.write(h1.getBytes());  //将字符串转换为字节
            //out.close();
            //追加写
            File file = new File(str);
            FileOutputStream bw = new FileOutputStream(file,true);
            for (int i = 0; i < 10; i++) {
                bw.write(h1.getBytes());
            }
            bw.close();
            x.close();

        }catch (IOException e){
            System.out.println(e.getMessage());

        }
    }
}

